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This Ethernet shield based on the W5100 Ethernet chip gives you a simple online way to add a micro-SD card slot for storing files over the network. It is compatible with Duemilanove (168 or 328), One and Mega (1280/2560) and has access to the SD library.
The W5100 provides a network (IP) stack that supports TCP and UDP. Supports up to four plug connections. Use the Ethernet library to write sketches that use shielded connections to the Internet.
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10PCS Ethernet W5100